VEC-1002K Owner's Manual
2 Meter FM Receiver Kit
21
FL1
FL2
U1, MC13135
3
Test Point
Connect Counter Here
1. Connect the frequency-counter ground lead to a ground point (case or PC
board).
2. Set the
TUNE
to 146.0 and apply power.
3. Touch counter probe to pin 3 and adjust L4 for a counter reading of 135.3
MHz.
OPTION 5: Calibrating with a scanner or extended-coverage HT.
If you don't have access to a counter, you may use a synthesized scanner or
extended-coverage 2-meter HT to pick up the oscillator signal. Set the scanner
to 135.3 MHz and position it near the kit.
1. Set
TUNE
to 146.0 MHz and apply power.
2. Slowly
adjust L4 until the oscillator signal is heard on the scanner at 135.3
MHz.
OPTION 6: Calibrating with an off-air signal.
If no other option is available, you may calibrate L3 using the signal generated
by a local repeater. To do this, you must know the repeater's operating
frequency. Also, the radio should be mounted in its case so the front-panel
tuning-dial scale is available. Begin by connecting a speaker (or phones) and an
antenna.
1. Set the
SQUELCH
pot
fully
counter clockwise (open).
2. Apply power and set the
VOLUME
pot for a comfortable background-noise
level.
3. Adjust the
TUNE
pot to correspond with the repeater's assigned operating
frequency.
4. Slowly
tune L4 until you receive the repeater's signal at the correct spot on
the dial.
This approach may require some patience, since the repeater must be active at
the time of your test.
Aligning L1, L2 for Maximum Receiver Sensitivity:
